Wrench



UNITED STATES PATENT OFFICE.

HENRY'ARTEMAS THOMPSON, OF FARMINGTON, MAINE.

WRENCH.

SPECIFICATION forming-part of Letters Patent No. 286,653, dated October 16, 1881-. 7 Application filed February 9, 1883. Renewed September 17, 1883. (lilo model.)

To (055 whom it may concern:

Be it known that I, HENRY A. THOMPSON,

of Farmington, in the county of Franklin and the fixed, and a the movable, jaw.

State of Maine, have invented a new and useful Improvement in Wrenches and I do hereby declare that the following is a full, clear. and exact description of the same.

My invention relates to wrenches, and is more particularly an improvement upon that form of wrench shown in Letters Patent of the United States granted me on the 2d day of November,-1880. In that patent is shown a form of wrench in which the jaws are formed with angular recesses, wh ereby they are adapted to grasp the corners of a nut, and are specially fitted to act as wrenches for removing and applying the nuts from the ends of carriage-axles.

My invention consists of a detachable hammer-head adapted to be held in the aforesaid jaws, thus converting the wrench temporarily, while the hammer-head is so held, into a hammer.

In the accompanying drawings, Figure 1 represents a side elevation of the wrench. Fig; 2 represents a central longitudinal section of the same. Fig. 8 represents a section of Fig. 1, with the hammerheador piece in place, as represented in said figure. Fig. 4 represents the hammer head or piece detached.

In these figures,'cindicates the shank; b, These jaws are double, one side of each being formed with an angular recess, 1, and the opposite side with the ordinary form of jaw, the first serving as the jaws of a wagon-wrench, and the latter as jaws of an ordinary monkeywrench. The shank a is made polygonal, and a sleeve, 2, of the movable jaw is fitted to slide thereon. An arm, 3, on this sleeve extends back to the rounded partitof theshank, carrying on the end a ring, 5. The round part is threaded, and a nut (preferably with handle, as shown) serves to force the jaws together and clamp any object held between them. The handle Bis made of wood, and is screwed upon the threaded end of the shank.

It has been common heretofore to form a hammer upon some part of the wrench, or to fit one or both of the jaws for that purpose; butthat plan soon causes the wrench to be injured and unfitted for use as a wrench by the battering it receives. To remedy this, and to provide without appreciable increase of expense a hammer-face upon the wrench, I make a separate hammer-head consisting of a face. 6, and shank f, as shown in Fig. 4. This shank is rectangular, preferably, and may be clamped in the angular jaws. I prefer to make the shank f equal in length to the angular jaws,

so that when the end of this shank rests upon the side of the shank a between'the jaws the head 6 shall also bear against the edges of said jaws; but this is not essential. This hammerpiece may be kept in the jaws ordinarily when the wrench is not in use, or is used asa hammer,and may be removed when the instrument is to be used as a wrench. It may be made at a trifling expense, and renders the wrench equally serviceable as a hammer.

In this form of wrench I do not connect the nut to the arm of the movable jaw, it being a. much cheaper construction to make the parts detached. This, however, leaves the movable jaw free without restraint, except when the nut jams it against the object held between it and the fixed jaw. In order chieflyto remedy this objection, I form in the shank a on that side which lies under the arm a shallow recess, Z, fitted to receive and retain a bowed spring, m, made of thin steel-plate. The sleeve and arm of the movable jaw hold this spring to the cavity, and the friction of the spring against the surface of arm and sleeve holds the movable jaw with sufficient stability.

I" claim as my invention In combination with a wrench having the' 

